.row h4 {
  text-align: center;
}

#menu {
  width: 0;
  overflow: hidden;
  box-shadow: 0 1px 1px #888, 1px 0 1px #ccc;
  position: absolute;
  background: #fff;
}


.menu {
  width: 130px;
  height: 40px;
  line-height: 40px;
  padding: 0 10px;
  text-align: center;
  color: #333;
  cursor: pointer;
}

.menu:hover {
  background: rgb(0, 80, 252);
  color: white;
}

.item {
  margin-bottom: 50px;
  overflow: hidden;
  height: 100%;
}

#input {
  width: 100%;
}

#tip{
  width: 100%;
  text-align: center;
  margin-top: 20%;
  color: #dedede;
}


